CVE-2026-33231

Summary

NLTK (Natural Language Toolkit) is a suite of open source Python modules, data sets, and tutorials supporting research and development in Natural Language Processing. In versions 3.9.3 and prior, nltk.app.wordnet_app allows unauthenticated remote shutdown of the local WordNet Browser HTTP server when it is started in its default mode. A simple GET /SHUTDOWN%20THE%20SERVER request causes the process to terminate immediately via os._exit(0), resulting in a denial of service. Commit bbaae83db86a0f49e00f5b0db44a7254c268de9b patches the issue.

Affected Software

Weaknesses

• CWE-306: CWE-306: Missing Authentication for Critical Function

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: yes
  • Technical Impact: partial

nltk: NLTK: Denial of Service via unauthenticated remote shutdown

Additional References

• https://access.redhat.com/security/cve/CVE-2026-33231
• https://bugzilla.redhat.com/show_bug.cgi?id=2449836
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33231.json
• https://access.redhat.com/errata/RHSA-2026:24977
• https://access.redhat.com/errata/RHSA-2026:19712

References

• https://github.com/nltk/nltk/security/advisories/GHSA-jm6w-m3j8-898g
• https://github.com/nltk/nltk/commit/bbaae83db86a0f49e00f5b0db44a7254c268de9b

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